I got the 525ss. Price doesn't change much, always low $30's. I read a lot of complaints on the 575ss which is the creamer version. Apparently the tiny holes are prone to clog from hop particles and the like, no personal experience.
I have exactly one day experience with the 525, and I love them. don't see myself needing a creamer.
Somewhere on here someone posted a link to some old stock 425's, which have the removable tip. I believe it's a site sponsor.